WordPress.com Account not linked to b;pg

I have different usernames for my wordpress.com account and my blog log in (I use wordpress for my blog). Can I add my current blog to my wordpress.com account? I see where it says to create a blog on my wordpress.com account, but I already have one so I just want to add that one. The only reason this has become an issue is because I’m trying to use OpenID to comment on other blogs and it’s not working. Thank you!!!
Blog url: http://letsgetbananas.com/